Hmm I think I´ll like to read people´s mind, because tha way you wont live in a world with lies, and you could also understand what people is trying to tell you :D
Probably the ability to speak every language in the world! :D
McGiverism - but supercharged,
or time travel.
To see through clothes :) Seriously, I would like to have an ability to fly like a superhero.
If everyone has a super power, then no body has a super power! Which also means that the only super power worthy of the name is the super power that negates all other super powers! And that's the once that I wish to have. It's gonna be funny seeing people trying to sneak up on me thinking they are invisible, or the confusion in the faces of the mind readers :)
I would like to be able to travel through time, does that count as a superpower?